Fluke ftp 1 safety test probe set 4mm catiii 1000v cativ 600v black red fluke 3869437 p the fluke ftp 1 is a fused test probe set with built in replaceable fuses for additional measurement protection if the probe fuse does blow these fused test probes will still allow the meter to indicate live voltage helping to prevent a possible misreading of no voltage present p p the probes have been constructed with fluke s unique suregrip technology and will mount onto any standard modular